Question

1. 6x-6y=? 5x+5a-5b=? 5a+10b=? 5ab-5a=? 5ab-5a=? 4y-2ay=? 7a+7b+7c=?
2. Daca x+y=25 si a=4 calculati
a) 7x+7y
b) 2x+2y-a
c) xa-ya
7. ab+ac= 80 si b+c= 16,calculati a
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Answer 1

1). 6x-6y=6(x-y);

5x+5a-5b=5(x-a-b);

5a+10b=5(a+2b);

5ab-5a=5a(b-1);

4y-2ay=2y(2y-a);

7a+7b+7c=7(a+b+c);

2). x+y=25, a=4,

a) 7x+7y=7(x+y)=7×25=175;

b) 2x+2y-a=2(x+y)-a=2×25-4=50-4=46;

c) xa-ya=a(x-y)=4×25=100;

7). ab+ac=80;

b+c=16;

a=?

a(b+c)=80;

a×16=80;

a=80:16=5;